Forming tool



y 1950 c. H. COLLINS 2,506,012

FORMING TOOL Filed April 15, 1946 4 Sheets-Sheet 1 FIG. I

HI'HIIIH Hill IIH'HIII I'HIHHIHIHII INVENTOR CHARLES H. COLLINS Wa -MW ATTORNEYS y 1950 c. H. COLLINS 2,506,012

FORMING TOOL Filed April l5, 1946 4 Sheets-Sheet 2 FIG.2

ugguum ATTORNEYS C. H. COLLINS FORMING TOOL May 2, 1950 4 Sheets-Sheet 15 Filed April 15, 1946 INVENTOR CHARLES H. COLLINS BY mem ATTORNEYS y 1950 c. H. COLL-INS 2,506,012

FORMING TOOL Filed April 15, 1946 4 Sheets-Sheet 4= INVENTDR CHARLES H. COLLINS iwzwzyw RTT D RNEH S fiatented May 2 UNITED STATES PATENT OFFICE FORMING TOOL Charles H. Collins, Miamisburg, Ohio I 4 v Application April 15, 1946, Serial No. 662,325

9 Claims.

This invention relates to tools and particularly to forming tools adapted for turning shaped workpieces.

The particular object of this invention is to provide an improved turning tool by means of which complex contours can readily be formed on workpieces in a lathe or similar turning machine.

Another object is to provide a contour turning tool having multiple adjustments in order to improve the character of the work produced a turret in a turret lathe or secured to the car riage or cross-slide of a lathe. 7

These and other objects and advantages become more apparent upon reference to the fol lowing specification taken together with the-accompanying drawings in which:

Figure 1 is a plan view showing a portion of a lathe or turning machine having a tool according to my invention mounted therein;

Figure 2 is a transverse sectional view indicated by the line 22 on Figure 1 and showing the turning tool of this invention;

Figure 3 is a plan section indicated by the line 3--3 on Figure 2;

Figure 4' is a plan section indicated by the line 4-4 on Figure 2;

Figure 5 is a partial vertical section indicated by the line 5-5 on Figure 2;

Figure 6 is a section through the tool bit and is indicated by the line 6-5 onFigure 2';

Figure 7 is a view showing one form of adjustable bar for actuating the cutting means and supporting rollers; l

Figures 8 and 9 are views of a modified construction especially adapted for turning shouldered workpieces and Figure 10 is a view showing a typical workpiece as machined by the modified tool arrangement shown in Figures 8 and 9. v

General. arrangement According to this invention, there is provided a frame having a passage'therethrough adapted for receiving a workpiece.

Rotatably mounted 1" on the frame are a plurality of members 'comprisingcutting means and rollers, the said rollers and cutting means boxing in the work as it is being turned.

The rollers and cutting means are adjusted about their pivots by abutments which are carried on a rotatable ring carried by the frame.

Theadjustment of the rollers and cutting means is equal and simultaneous so that the work continuously supported by the said rollers.

Connected with the adjustable ring is an arm which is abutted by a plunger so that movement of the plunger will move the said arm and there'- through the adjusting ring to vary the positions of the rollers and cutting means.

A cam is located to ride against one end of the aforementioned plunger so that as the cutting tool is moved along the work the cam will actuate the plunger and adjust the cutting means relative to the work to generate any predeter- The aforementioned cam may consist of two straight bars pivoted at one end and angularly adjustable or may consist of one straight bar and one bar having a pre- 1 determined configuration for engaging the mined contour thereon.

plunger.

A modified mechanism for moving the adjusting ring and arm consists of a plurality of stops j and an indexing stop whereby the arm and ring are shifted quickly to adjust the cutting means radially of the workpiece thereby to 'form shoulders. By combining the adjustable bar mechanism with the indexing stop mechanisma workpiece may be turned having both shoulders" and tapered or contoured portions.

Structural arrangement Referring to the drawings, the device of this invention consists of a hollow cylindrical. frame member indicated at In in Figures 1, 2, and 3" which may be shaped at one side to be received into the face of a turret l2 of a lathe or other 'j turning machine. Optionally, the frame l0 may be supported by a bracket 14 having a foot I6.

This is best illustrated in Figure 3 wherein it will I be seen that the foot I 6 of the bracket I4 is adapt-v ed for being secured to a lathe carriage or crossslide.

Carried on the face of the frame Ill opposite the turret l2 are a plurality of arms I8, pivoted to the said frame as by the shoulder screws 20 and 1 having at their one ends the freely pivoted r011- ers 22.

Also pivoted on the same face of the frame in as by the shoulder screw 24 is an arm'26 efcts .T 'f Y emilrisela l ve ail? idi it stool bit to permit its adjustment in all directions including angular adjustment in order precisely v to locate the'cutting-edge of the toplrelative to 10 the workp i'ece f" The lower end of the arm 26terminates in the V wedge portion 34 formed on a radius swungg, from the center'of the screw 24. The wedge 3}! is closely received between the frame it and-the 15 'face of a correspondingly shaped wedge-member.

86 which is secured to the face of by screws 38.

Each of the arms 18 and 2% includes a surfe gs:

: which may comprise aqhardened wear-plate 4'2 6 si lfereie iitt d bylhes ewes.

s iadiu tablet a ckfifi. i1 Th cerneqQIt-a meat wh h s i iet ble t e, fra e 4 fliwhile bein ed 1' es' tio' t ereo l m y 'p ali s52 fas en d, iqfth safi rine and name be? h flan e 54?;Q 1theirf eni 1i Byviro etln e 3 n' c ck i e dire ti n asivi wed 7 1.30 ,nthew rms 1'8 end ther a tuated. inter, qvv e re tio tb'c h lejthef ool 3 0 a d th Zlflt we 'd t efienterio ct e workp c 5L6,

i be n rned.v T dF e r "it will be;

aiid thepoint of cqn'tagtlof th toei sce el co 1 1a, sqitheti Si ultane u l adjus n h an s-s e; w k s contin ously, s

rplIeIfi 22am thew ic eesti hotel. I xspq the s rews 2 vThi rom m smec movement of the rollers and tooljcrelative e press. c1 Tpl gnsers; EBimay.

y fixed abut" hts so hat the-motion of the work engagingflmembersc is positive in both t th poin 50 .cO lPectlb t 11 15122; 3 d l' gt situate workpiece formed with ss ssed 2 Y "u theb inalr ei abl .ltvhet lill ol fli ere ses-secede. o t d i i The bar 84 is best shown in Figure 7 wherein it will be seen to comprise a member 90 which is hollowed out to receive a bar 92 that is pivoted to the member 90 at 94. 7 An' adjustable screw 96 in the member 90 abuts an inclined surface 98 on the end of the bar 32 for adjusting the angularity of the said bars. Preferably, the member 90 has inscribed'th'ereon a scale shown at I00 so that the amount of relative movement between the cutting tool rand. the bar can be lobserved. also, the bar" SZ haS preferably;inscribedithereonthe-graduationsshown at I02 by means of which the angularity of the bars can be determined. 7 The manner of securing the bar 84 in the turning-mac'hine is shownin Figure 1 in which viewit wil hbe seen thg tgthe bar is secured to the headsteel; of the turning machine bya bolt or other suitablerigidmeans'as at I04. Then, as the tool ingye s toward the headstock and the plunger '80 moves'down the incline ef the bar 92, the'spring 8.e s sstl e xnfittee er. e tin -satanic Gated at 5B; u 4 i witb this Om ime V manner of actuating therarm plate 14; Th

nl lll ei q tie, h .i

eti i sere f t mess n er may be of any size and may be V In'using a tool accord may be'facilitat d by a which r adbyf positioii'each time 'or tdbe'ihit xenei ly etn resect-msit mwh n; anew set u 7 t f 'It' will be understood that; .this inlentionn; .i ,telbi let e.em d fiteiiqnit.v rid r for 1y; it is'desire'd to'compreh, dshc within this invention 'as-m'ay fall within 'thef scope of the appended-simmers? Il le m;

1 ea aire ir eeiee w re said frame; means comprising a guiding surface on said frame and a correspondingly shaped surface on the free end of said arm for guiding the said arm in movements about its pivot; a member rotatably mounted on said frame and having rigid abutment means to engage said arm on one side of its pivot and yielding abutment means to engage said arm on the other side of the pivot; an adjustable cam bar adapted for reciprocation relative to said frame to actuate said rotatable member; and workpiece supporting rollersfor engaging a workpiece opposite a tool carried in said arm for continuously supporting the workpiece while being turned by said tool.

2. In a turning tool; a frame having a workpiece receiving aperture; tool carrying and work! piece supporting arms pivotally carried on said frame and positioned to engage the peripheryof a workpiece at spaced points; an actuating ring rotatable on said frame and having a pair of abutments for each arm, said abutments engaging each arm on opposite sides of its pivotal con nection with said frame; yielding means continuously urging said actuating ring in one direction; and cam means movable relative to said frame for actuating the said ring in the opposite direction against the thrust of said yielding means.

3. A frame having a workpiece receiving aperture; a tool carrying arm and a plurality of workpiece supporting arms pivotally mounted on said frame; an actuating ring on said frame having spaced abutments in engagement with each of said arms on opposite sides of the pivotal connection thereof with said frame whereby said arms may be simultaneously actuated in equal movements to and from the axis of a workpiece; yielding means continuously urging said ring in a direction to withdraw said arms from the axis of a workpiece in said aperture; and cam means engaging said ring and responsive to relative movement between said frame and cam means for actuating said ring in a direction to move said arms toward the axis of a workpiece in said aperture.

4. In a turning tool; a fram having an aperture for receiving a workpiece; a cutting tool supporting arm pivoted to said frame; steadyrest roller supporting arms pivoted to said frame, the tool and rollers on said arms engaging a workpiece at points spaced around the periphery thereof; an actuating ring rotatable on said frame; means connecting said ring with said arms comprising an adjustable abutment between each arm and said ring and resilient means maintaining said arms in firm contact with their respective abutments; yielding means continuously urging said ring in one direction; a cam bar; an adjustable abutment between said cam bar and said ring; and means guiding said cam bar in reciprocation relative to said frame thereby to actuate said ring.

5. The combination in a turning tool of a frame; arms spaced around said frame and pivotally supported thereon for engagin a workpiece at spaced points in supporting and cutting relationship; an actuating ring rotatably carried by said frame and engaging each of said arms on opposite sides of the pivotal supports thereof; and means for actuating said ring in opposite directions of rotative movement for actuating said arms in movements toward and away from said work axis.

6. In a turning tool; a frame having mounting means whereby the said tool may be mounted on a lathe carriageor on the face of a lathe turret; a plurality of arms pivoted on said frame and one comprising means for supporting a cutting tool and the others having workpiece supporting rollers thereon; a member rotatably carried on said frame to actuate said arms simultaneously and in equal movements toward and away from a workpiece being operated; yielding means continuously urging said member in one direction and an adjustable sine bar reciprocable relative to said frame for actuatin said member in the opposite direction; and guiding means for the arm supporting the cutting tool comprising an arcuate end on the said arm adjacent the tool and an arcuate guideway on said frame engagin said arcuate end.

7. In a box tool; a, frame; a plurality of arms pivoted on said frame and one thereof comprising tool supporting means and the others thereof having mounted thereon workpiece supporting rollers; guiding means on said frame for supporting the free end of at least the one of said arms having the tool supportin means; an actuating ring rotatably mounted on said frame and having abutment means to engage each of said arms on one side of its pivotal support on said frame; resilient abutment means to engage the said arms on the other side of their pivotal support on said frame; and means reciprocable relative to said frame for actuating said ring in rotary movements on said frame thereby to actuate said arms in unison toward and away from the axis of a workpiece extending therebetween.

8. In a box tool; a frame; a plurality of arms pivoted on said frame and one thereof comprising tool supporting means and the others thereof having mounted thereon workpiece supporting rollers; guiding means on said frame for supporting the free end of at least the one of said arms having the tool supporting means; an actuating ring rotatably mounted on said frame and havin abutment means to engage each of said arms on one side of its pivotal support on said frame; resilient abutment means to engage the said arms on the other side of their pivotal support on said frame; and means reciprocable relative to said frame for actuating said ring in rotary movements on said frame thereby to actuate said arms in unison toward and away from the axis of a workpiece extending therebetween, said last mentioned means including mechanism for bringing about the movement of said ring in steps.

9. In a box tool; a frame; a plurality of arms pivoted on said frame and one thereof comprising tool supporting means and the others thereof having mounted thereon workpiece supporting rollers; guiding means on said frame for supporting the free end of at least the one of said arms having the tool supporting means; an actuating rin rotatably mounted on said frame and having abutment means to engage each of said arms on one side of its pivotal support on said frame; resilient abutment means: to engage the said arms on the other side of their pivotal support on said frame; and means reciprocable relative to said frame for actuating said ring in rotary movements on said frame thereby to actuate said arms in unison toward and away from the axis of a workpiece extending therebetween, said means including a plurality of abutments each effective for positioning said ring in a different angular position, and being adapted for becoming successively effective during the relative reciprocation of said 

